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Process for reducing permanent deformation of low-linearity styrene type thermoplastic elastomer

A thermoplastic elastomer and styrene-based technology, which is applied in the field of reducing the permanent deformation of linear styrene-based thermoplastic elastomers, can solve the problems of large permanent deformation, difficulty in accurate measurement, and difficult preparation of thermoplastic elastomer products, etc., to achieve permanent The effect of small deformation

Inactive Publication Date: 2004-12-29
BALING PETRO CHEM CO LTD SINOPEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, Chinese patent CN85 102259B discloses a method for reducing the permanent deformation of SBS. This patent is to add a small amount of conjugated diolefins to styrene monomers in the first step of polymerization, but the conjugated diolefins The amount of olefins is only 0.01-5.0%, which is difficult to measure accurately and is not easy to realize industrialization
Secondly, the permanent deformation of the product obtained by this method is still relatively large, in the range of 16% to 44%, usually 28% to 40%, and it is difficult to prepare linear styrenic thermoplastics with a permanent deformation of less than 20%. Elastomer products
Third, the patent does not involve α-methylstyrene and isoprene-based thermoplastic elastomers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In a clean 5 liter iron kettle (with stirring) with nitrogen protection, (or 50m 3 In the polymerization kettle), add the measured solvent cyclohexane, styrene, and tetrahydrofuran, raise the temperature of the kettle to 40°C to 50°C, and then add the initiator n-butyllithium (or sec-butyllithium). After reacting for 30 minutes, add the measured styrene and butadiene into the reaction kettle at the same time, control the maximum temperature not to exceed 110°C, and react for 30 minutes. Terminate the reaction and discharge, add 2.6.4 (2.6-di-tert-butyl, 4-methylphenol) in an amount of 0.6% of the total weight of the monomers, coagulate the glue to obtain a white polymer, and obtain the product after drying. Using styrene and butadiene as reactive monomers, experiments were carried out with different ratios of styrene and butadiene, and the experimental data are listed in Table 1.

[0018]

Embodiment 2

[0020] Experiments were performed with isoprene instead of butadiene. The reaction conditions are the same as in Example 1, and the experimental data are listed in Table 2.

[0021]

Embodiment 3

[0023] Replace styrene with α-methylstyrene, the reaction conditions are the same as in Example 1, and the experimental data are shown in Table 3.

[0024]

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PUM

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Abstract

A process for preparing the low-linearity thermoplastic styrene elastomer with less permanent deformation includes the stage-1 reaction of styrene monomer on n-butyl lithium or para-butyl lithium as trigger in the solvent of cyclohexane or the mixtural of cyclohexane and hexane at 40-50 deg.C for 20-50 min, adding conjugated diolefin monomer and styrene monomer, stage-2 reaction at 50-60 deg.C for 20-50 min, and stage-3 reaction at 50-60 deg.C for 20-50 min. Its advantages are correct metering and simple operating.

Description

technical field [0001] The invention relates to a method for reducing the permanent deformation of linear styrene-based thermoplastic elastomers, more specifically, a method for reducing the permanent deformation of linear SBS, SIS, and m-SBM-S. Background technique [0002] Generally speaking, linear styrenic thermoplastic elastomers can be synthesized by the following route: using alkyllithium as an initiator, cyclohexane as a solvent, tetrahydrofuran as an activator, styrene or α-methylstyrene, butane It is a block copolymer formed by anionic solution polymerization using olefin or isoprene as a monomer in a three-step process. [0003] In the prior art, Chinese patent CN85 102259B discloses a method for reducing the permanent deformation of SBS. This patent is to add a small amount of conjugated diolefins to styrene monomers in the first step of polymerization, but the conjugated diolefins The amount of olefin is only 0.01-5.0%, which is difficult to measure accurately ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F2/00C08F12/08C08F297/04
Inventor 张红星梁红文李望明
Owner BALING PETRO CHEM CO LTD SINOPEC